The sides of the slab are more important than under it. The earth is a pretty good insulator, if you get perimeter insulation well below the frost depth after a few years the soil under the slab will stay warm. The heat coming from the center of the earth is substantial and will warm the soil. We had one equipment building permitted in Prudhoe Bay to be built on grade. The air temperature in the building was kept about freezing, but heat from inside the earth, and the lack of cold winter air chilling the subsurface caused permafrost to melt under the building. They added a couple hundred tons of rock every year to keep the floor at ground level.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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